Electric-arc lamp.



No. 638,5!2. Patented Dec. 5, I899. G. HEIDEL.

ELECTRIC ARC LAMP.

(Application filed Mar. 8, 1899.)

(No Model.)

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UNITED STATES PATENT OFFICE.

GUSTAVOS I'IEIDEL, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE GLOBEELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 638,512, dated December5, 1899.

Application filed March 8, 1899. Serial No. 708,222. (No model.)

To all whom it may concern:

Be it known that l,GUsTAVOsl-IEIDEL,a cit-izen of the United States,residing atthe city of St. Louis,in the State of lhlissourhhave inventedcertain new and useful Improvements in Electric-Arc Lamps, of which thefollowing is a full, clear, and exact description, reference beinghad tothe accompanying drawings, forming part of this specification.

My invention relates to an electric-arc lamp in which the carbon pencilsare maintained in contact with each other by a simple arrangementcomprising a pair of coincident spring controlled sheaves by which thestem of the lower-carbon holder connected thereto is gradually-raised asthe pencils are worn away or consumed.

Figure I is a vertical sectional view taken through the lamp. Fig. II isa cross-sectional View of the spring-sheaves. Fig. 111 is a top view ofthe sheaves. Fig. IV is a view of the lower-pencil holder, with itssupporting-stem shown in cross-section. Fig. V is a view of a modifiedconstruction, illustrating the lamp applied to a supporting-standard, soas to serve as a students lamp. FigVI is a view showing the lampillustrated in Fig. V applied to a gas-bracket.

1 designates the lamp-housing, provided with a dome top 2,having an eye3, by which the lamp may be suspended. Carried by the housing 1 at itslower end is an upper ring 4, to whichalower ring5is connected by ahinge6, so that the said rings may be separated by swinging the lower one onsaid hinge, and when brought together the rings are connected by asuitable catch 7.

8 designates a globe attached to the lower ring by means of screws 9.

Seated in the ring 4: is a cross-bar 10, that is provided with a centralaperture, in which a sleeve 11, that supports the upper-pencil holder,is held.

13 are the pencils in the upper holder.

Vithin the sleeve 11 is a bushing 14s, of insulating material.

15 designates a stem, by which the lowerpencil holder 16 is carried,this lower holder being provided with pencils 17. The stem extendsthrough the bushing 14, and its upper end is attached to and supportedby a cross-piece 18, that is movably mounted in the housing 1 andconnected to lift-cords 19.

In the housing 1 are supports 20, that contain a shaft 21, and on thisshaft are grooved sheaves 22 and 23, to which the lift-cords 19 areconnected. The sheaves 22 and 23 are both loosely mounted on the shaft21, (see Fig. 11,) and one end of one of the cords 19 is connected toone of these sheaves, while one end of the other cord 19 is connected tothe other sheave. Interior of the sheaves is a convoluted spring 24,having one end thereof attached to one of the sheaves and the other endattached to the other sheave. It will therefore be understood that whenthe cords 19 are drawn upon the convolutions of said spring are drawntogether, tightening or winding the spring, and when the cords arerelieved the spring tends to unwind and turn one of the sheaves in onedirection and the other in the opposite direction and wraps the cordsaround the peripheries of the sheaves. Therefore when the pencils 13 and17 are to be introduced into their holders the lower holder is drawndown into the position shown in dotted lines, Fig. I, and the spring 24is thereby wound within the sheaves, after which on relieving thedownward pull upon said holder and its supporting-stem 15 the lowerholder again moves upward into the position shown in full lines, Fig. l,to bring the pencils into contact with each other, and as the pencilswear away they are kept together by the gradual ascension of the lowerpencils.

25 designates a binding-post, to which one of the supply-wires 26 isconnected, and 27 is a wire connecting the binding-post 25 to abinding-post 28, carried by the cross-piece 18, from which the currentis conducted through the stem 15 to the pencils 17.

29 designates a binding-post having a supply-wire 30 connected thereto.Leading from the binding-post 29 is a wire 31, that connects with acontact 32, carried by the upper ring 4;.

33 is a contact carried by the lower ring 5 and arranged to bear againstthe contact 32 when the rings at and 5 are placed together.

34 is a binding-post carried by the sleeve 11 of the upper-pencilholder, this last-named binding-post being connected to the contact 33by a wire 35.

It will be apparent from the foregoing that when the lamp is closed byraising the lower ring 5 against the upper ring and connecting itthereto by the catch 7 the contacts 32 and 33 are brought together and acircuit is completed from the binding-post 29 to the pencil holder 12,but as soon as the lower ring 5 is moved away from the upper ring thecontacts 32 and are separated and the circuit to the pencil-holders isbroken, thereby removing all danger in the handling of the carbonholders and replacing the pencils therein.

In Fig. V, I have shown the lamp in the form of a students lamp, inwhich the housing 1 is supported on a standard 36. The interior of thelamp is approximately the same as that shown in Fig. I; but the stem 15extends exterior of the lamp and is curved outwardly and upwardly toreceive the lower pencil 17, that is encircled by a sectional disk 37,adapted to receive the dust resulting from the consumption of thecarbon. The upper pencils 13 are supported in a holder 12, secured toand projecting from the sleeve 11. The pencils are inclosed by asuitable chimney 8. The conducting-wires are controlled by a cutout 37.

In Fig. VI, I have shown the lamp illustrated in Fig. V attached to agas-bracket A by means of a support 36.

I claim as my invention- 1. In an electric-arc lamp, an upper-pencilholder, a lower-pencil holder, a stem on which said lower-pencil holderis supported, a pair of sheaves, a convolute spring coiled within saidsheaves and having its ends connected to them respectively, and a pairof cords each of which has connection with said stem, and one of whichis connected to one of said sheaves and the other to the other of saidsheaves; substantially as described.

2. In an electric-arc lamp, a pair of pencilholders, one of which ismovable with relation to the other, a housing, a pairof sheaves mountedin said housing and having within them a convolute spring the ends ofwhich are connected to them respectively, means of connection from saidmovable pencil-holder to said sheaves, a ring carried by said housing, asecond ring hinged to said first-named ring, contacts carried by saidrings adapted to bear against each other when the rings are broughttogether, and means for supplying electrical current to said parts;substantially as described.

3. In combination with the movable pencil of an are electric light,oppositely-rotating coaxial sheaves having winding connections with theopposite sides of the pencil, and a convolute spring coiled within saidsheaves and having its ends attached to them respectively, whereby theyare Wound in opposite directions; substantially as described.

E. S. KNIGHT, G. A. TAUBERSCHMIDT.

